The stabilities of the different isomers of C60Hn have been calculated
using the AM1 hamiltonian and the program MOPAC 6.0. The most stable
isomer of C60H2 has the two CH groups forming an edge between two hexa
gonal faces (the hex-hex edges) of the truncated icosahedral structure
of C60. Successive pairs of hydrogen atoms add to successive hex-hex
edges, the centres of which are arranged in an octahedral manner about
the truncated icosahedron.